Oxygen Saturation (SpO2) Checker

Interpret your oxygen saturation (SpO2) level and heart rate with our free Oxygen Saturation Checker. Understand whether your readings are normal and when medical attention may be needed.

SpO₂ Calculator

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Oxygen Status

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Heart Rate

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Recommended Medical Devices

These products may help you monitor your health at home. Always consult your healthcare provider before making medical decisions.

Amazon Choice
Blood Oxygen Saturation Monitor with Built-in Memory
★★★★★ 4.6/5

ACCURATE & RELIABLE: Plethysmograph wavefom provides a visual representation of heartbeat and the amount of blood flowing through the blood vessels; perfusion Index corresponds to pulse strength; both of them help determine the accuray of readings

Pros
  • Store up to 12 groups data of Oxygen Level
  • Pulse Rate and Perfusion Index in record list screen;
  • Quickly view your last 12 times historical data with one click
🛒 Buy on Amazon
Amazon Choice
Blood Oxygen Saturation Monitor Rechargeable
★★★★★ 4.2/5

The oxygen meter finger pulse oximeter can read and show up to 100% on a bigger LED display. Its design inspiration comes from sports cars, making it a great choice as a gift.

Pros
  • Portable and Durable
  • Sport Enthusiasts
🛒 Buy on Amazon
Doctor Recommended
Bluetooth SPO2 Blood Oxygen Saturation Monitor
★★★★★ 4.1/5

The lightest, smallest ring sensor for continuous tracking, durable and adapt to most fingers.

Pros
  • DETAILED APP & PC REPORT
  • UNLIMITED STORAGE IN APP
  • UNUSUAL DATA MARKING
🛒 Buy on Amazon
Affiliate Disclosure: As an Amazon Associate, PulmoCare may earn from qualifying purchases. This does not affect the price you pay.

What is Oxygen Saturation (SpO₂)?

Oxygen saturation (SpO₂) measures the percentage of oxygen carried by your red blood cells. It is commonly measured using a pulse oximeter placed on your fingertip. Monitoring SpO₂ is useful for people with respiratory conditions such as COPD, asthma, pneumonia, pulmonary fibrosis, and sleep apnea.

Normal Oxygen Saturation Levels

SpO₂ Interpretation
95–100% Normal oxygen level
92–94% Borderline; monitor symptoms and consult your doctor if persistent.
90–91% Low oxygen level; medical assessment is recommended.
Below 90% Medical emergency. Seek immediate medical care.

Common Causes of Low Oxygen Levels

  • COPD
  • Asthma attacks
  • Pneumonia
  • COVID-19
  • Pulmonary fibrosis
  • Heart failure
  • Sleep apnea
  • High altitude

Tips for Accurate Pulse Oximeter Readings

  • Keep your hands warm.
  • Remove dark nail polish.
  • Remain still while measuring.
  • Rest for a few minutes before taking a reading.
  • Ensure the sensor fits properly.

Frequently Asked Questions

For most healthy adults, an SpO₂ between 95% and 100% is considered normal.

An SpO₂ of 92% may indicate reduced oxygen levels and should be assessed, especially if symptoms are present.

Seek emergency care if your oxygen level is below 90% or you have severe shortness of breath, chest pain, confusion, or bluish lips.

Yes. Smoking can affect lung function and, over time, may contribute to lower oxygen levels.

Yes. Oxygen saturation is often slightly lower at higher altitudes because there is less oxygen available in the air.
Medical Disclaimer

This calculator is intended for educational purposes only and does not replace professional medical advice, diagnosis, or treatment. If you have persistent low oxygen readings, severe shortness of breath, chest pain, confusion, or other concerning symptoms, seek immediate medical care.